化简 (x^2+y^2)/(x-y)+2xy/y-x
问题描述:
化简 (x^2+y^2)/(x-y)+2xy/y-x
答
(x^2+y^2)/(x-y)+2xy/y-x
=(x^2+y^2-2xy)/x-y
=(x-y)^2/(x-y)
=x-y
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